Improvement in lithographic presses



I y. HUBER.

i Lithographie-Presses.

N0, 145.520. lPatentedljec.9,1873.

' UNITED STATES PATENT FFICE.

BEBTHOLD HUBER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN LITHOGRAPHIC PRESSES.

Specification forming part of Letters Patent No. 145,420, dated December 9, 1873; application filed May 28, 1873.

To'l all whomt may concern.'

Beit known that I, BERTHOLD HUBER, of Boston, in the county of Suffolk and State of Massachusetts, have invented a certain new and useful Improvement in Lithographie Presses, of which the following is a complete specification The nature of my invention consists in a device by which the stone (in a press driven by power) is caused to be sent forward underr the scraper-bar and returned by the simple movement of a lever, thus relieving the workman from a great outlay of strength; the object of the invention being to adapt the ordinary hand-press to the action of power, the power serving to move the stone backand forth, the placing of the paper, the inking, &c., being done by hand, as in an ordinary handpress. K

Figure l is an elevation of a lithographie press with my invention attached. Fig. 2 is a plan of the same. Fig. 3 is a cross-vertical section of the same.

Let A represent the frame; B, the bedpiece; C, the stone; F, the cylinder, upon which the bed-piece travels 5 D, the scraperbar; all of Vwhich parts are made in the usual manner. The cylinder F, upon which the bedpiece B rests, is hung upon links G2 G2, Figs. l and 3. The lower ends of these links rest upon cams G1 G1, which are attached to the shaft G, and areoperated by the lever G2. Thus when the leverl is up the cams G1 assume an inclined position, which allows the links G2 to lower, and consequently the cylinder F. As the bed-piece B rests upon this cylinder the lowering of it will allow the stone C to fall away from the scraper-bar I). fhen the lever is down, as shown in Fig. 1, the cams G1, links G2, and bed and stone B C are thrown up against the scraper-bar D. K K, Src., are rolls upon which the bed-piece B rests when it is not thrown up by the cylinder F. H1 H1 on the shaft H2 are rolls which receive the bed piece after it has passed under the scraper-bar and the impression taken, and the cylinder F has been lowered. The shaft H2 extends as shown in Fig. 2, and has upon it the gear-wheel H and the two pulleys I I. The pulley I is fast to the shaft H2, and causes it to revolve in the direction indicated by the arrow. The pulley I is loose on the shaft, but is attached to the gear H. The gear H engages with the gear F', which is on the shaft of the cylinder F. Hence when the pulley I revolves, as indicated by the arrow, it will cause the gear F and cylinder F to revolve in the opposite direction.

By this arrangement of the pulleys, I am enabled to obtain the desired reverse motion for the two carriers-na1nely, the forwardingcylinder F and the returning-rolls H H-by a continuous motion in the same direction of the drivin g-belt P.

The belt-shifting device consists of the slide Q, belt-guards q q, lever B', and rockershaft It and arm S. Extending laterally to this arm I affix a chain or strap, S1, which connects it with the end of the bed-piece B, at S3,'so that when the bed-piece B has traversed the desired distance it will act on the lever S, and turning' the rocker-shaft R cause the lever It to move the slide or belt-shifter Q q q so as to throw the belt from the pulley I to the pulley I. The shifter Q has a handle, Q1, for convenience of the operator.

The operation of my invention is as follows: The bed-piece B is runback from un` der the scraper-bar D. The stone C is inked, a-nd the paper to be printed upon laid on, so that its end will just underlie the scraperbar. Then the lever G3 is brought down, which throws up the cylinder F, and the stone O is brought up, so thatl the scraperbar I) presses hard upon the paper. As the cylinder F is revolving the bed-piece is carried forward under the scraper-bar, and the print is made. The further advance of the bed-piece causes a strain upon the chain S1, which, acting upon the belt-shifting device S R Q, will throw the belt from I to I/ that is, will cause the belt to cease to act upon the cylinder F, and operate instead the return-rolls H1 H1. Now, by raising the lever G3, the cylinder F is removed from contact with the bed-piece B. The bed-piece falling upon the rolls H1 H1 is carried back to the position from which it started.

I claim as my invention- In a press, the combination of the bed-piece B, the chain S1, shifting device S R Q, and gears H F', operating substantially as described, and for the purpose set forth.

BERTHOLD HUBER.

Witnesses:

WILLIAM EDsoN, FRANK G. PARKER. 

